Kühn Controls

RelayGo relays by Kühn Controls AG


The products

General Information


Silver and Nickel alloys (AgNi) and silver tin oxide (AgSnO2).
Other alloys on request.
Depending on the model, a 0,2 μm or 10 μm gold-plating is added to ensure high conductivity and allow switching low level loads in corrosive ambient.
The distance between contacts (GAP) and the speed of contacts opening will determinate arch length and duration.
In VAC a 0,5 mm gap is enough to eliminate the arch.
In VDC is critical to manage contact distance (GAP) depending on the current and voltage.
See the tables for each relay “Maximum VDC current”, as well as special DC applications.
We manufacture different contacts:

Serial contacts: Two or three contacts in series are equivalent to multiply the GAP increasing VDC cut.

Parallel contacts: Cannot switch higher loads but increases current stability and reliability.

Twin contacts: The blade is divided into two parts, each with its own contact, both contacts press down each on their own independent fixed contacts.
This system is particularly good for reliably switching at very low levels (increasing MTBF).

Double break contacts: The double break contact arrangement is equivalent to two contacts connected in series.

The maximum intensity supported corresponds to only one contact.
This system allows for higher DC operating voltages.
This system prolongs contact life by inhibiting or reducing the arch. In parallel RC suppressors or varistors can be connected.
In VDC applications with inductive loads, a diode must be placed inverse, in parallel (free-wheeling).
Typical contact RM and RQ series resistance is 50mΩ.
This resistance depends on materials used, pressure among them and contamination.
Maximum voltages are referred to contacts poles and between contacts and coil, complying with EN 60947 / 4 / 5 and VDE 0110 established maximum values, considering pollution, insulation material quality, shape, position and dimensions.
Maximum current is referred to each model, considering stable conduction (ITH) in VAC.
Maximum power indicated is the maximum switching value contacts can support.
This value can be limited and not always meet the maximum power obtained by multiplying maximum voltage with maximum current.


The coils are molded in polybutylene with fiberglass (130°C). Enameled wires of Class F specification are used (155°C).
They are always verified, 100%, considering quality tolerances.
They are wound on automatic precision winding machines, with the number of turns and wire tension accurately regulated and monitored.
Coil resistance is measured at 20°C and is regulated within ± 10% of specified value.
They can be reviewed in each model specification table.
We can produce every specific voltage coil our customers require meeting their specifications.

Minimum working voltage (pull in): this is the minimum voltage that must be supplied to the coil to ensure contacts change over and the relay is energized, below you will find pull in voltages:

working: 50 Hz 60 Hz
VAC 50 Hz relays 0.80xUn 0.85xUn
VAC 60 Hz relays 0.75xUn 0.80xUn
VDC relays 0.80xUn 0.80xUn

Maximum release voltage (drop-out): this is the maximum voltage at which the contacts change over and NO contacts close without any vibration.
The values of voltage specified are those at or below which the relay must drop out:

VDC relays: ≥ 10% of Un
VAC relays: ≥ 15% of Un

Ambient Temperature: The ambient temperature has an influence on the coil resistance and on its thermal dissipation capacity.

Ambient Temperature

Blue curve represents the variations of the pull in voltage (% Un) in relation with the ambient temperature (T).
Red curve indicates the maximum values of the voltage applied (Ub) to the coil in relation with the nominal voltage (Un) at the ambient temperature (T).

Product listing and cross reference:

Modules for sockets MM Interface relays RF Industrial relays RM Power relays RP  
Miniature relays RQ Railway relays RR Timer Module TM Solid state relays RS Sockets and accessories for relays

Data sheets:

Modules for sockets MM Interface relays RF Industrial relays RM Power relays RP
Miniature relays RQ Railway relays RR Timer Module TM Special relays RE

Related sites:

General information Quality certificate Coding and labeling Coil circuits Applications and symbol index Equivalences

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